White noise estimation for discrete-time systems with random delay and packet dropout

This paper is concerned with the optimal and suboptimal deconvolution problems for discrete-time systems with random delayed observations. When the random delay is known online, i.e., time stamped, the random delayed system is reconstructed as an equivalent delay-free one by using measurement reorganization technique, and then an optimal input white noise estimator is presented based on the stochastic Kahnan filtering theory. However, tb_e optimal white-noise estimator is timevarying, stochastic, and doesn＇t converge to a steady state in general. Then an alternative suboptimal input white-noise estimator with deterministic gains is developed under a new criteria. The estimator gain and its respective error covariance-matrix information are derived based on a new suboptimal state estimator. It can be shown that the suboptimal input white-noise estimator converges to a steady-state one under appropriate assumptions.     

Codebook design for uplink of densely small cells

The shrinking of cell-size brings significant changes to the wireless uplink of densely small cells （DSCs）. A codebook design is proposed that utilizes the strong line of sight （LOS） chan- nel component existing in a DSC system for uplink of the DSC system. To further improve the uplink performance, the high-rank codebook is designed based on singular value decomposition （SVD） due to the unnecessary preservation of strict constant modulus in the DSC system. And according to the simulation result, the proposed codebook leads to significant sum-rate gain and appreciable block error rate （BLER） performance improvement in the DSC system.     

Collaborative Project Management: A Systemic Approach to Heavy Equipment Manufacturing Project Management

Quite often over the last decade, heavy equipment manufacturers are trying to improve their project management performance with the use of effective project management methods. However, the challenges encountered aren’t isolated problems and a systemic approach is required. This paper exemplifies how a systemic approach can be applied to heavy equipment manufacturing project (HEMP) management, through of a multifaceted vision. The findings present in the paper are based on a two-year case study in a metallurgic equipment manufacturing enterprise in China. Based on the analysis of HEMP management problems and the contributions on systemic approach application in project management, the paper enriches existing theory by: (1) interpreting the HEMP management system with the top-down disassembly method; (2) developing the collaborative project management approach with a systems view highlighting the project characteristics management and inter-departmental collaboration; (3) making suggestions for systemic approach application in project management. For practitioners and researchers, the findings are particularly meaningful for manufacturing project management and systemic approach application.     

Removal of NO<Subscript><Emphasis Type="Italic">x</Emphasis></Subscript> by radical injection

Removal of NOx(DeNOx, NOx is the total of NO and NO2) from flue gas by radical injection has been investigated .the discharge characteristics were examined and the steady streamer corona was acquired hy adjusting the nozzle gases properly. It was Found that an increase in the voltage resulted in a decrease in the NO concentration and the concentration of the NO2 increased at tow voltages but decreased as the voltage rose to a certain level. The DeNOx efficiency increased as the applied voltage rose and reached a maximum of 70% when the voltage approached the breakdown voltage. The hypothetical mechanism of NOx removal suggested that the radicals formed in the discharge process converted the NO and NO2 into acidic species. The Monte Carlo method was used to calculate the rate coefficients and the productivity of the radicals, and then the concentrations of both NO and NO2 and the DeNOx effielencies were calculated with chemical kinetics. The calculated DeNOx efficiencies were coalparable with the experimental DeNOx efficiencies at low voltages, but were lower at high voltages.     

注水系统运行方案优化研究

给出了油田注水系统运行方案的优化方法,建立了以注水系统耗电量最小为目标函数,以井口压力、配注水量、注水站和注水泵排量为约束条件的优化数学模型,提出了两层优化方法,编制的软件对某油田注水系统运行方案进行优化计算,取得了巨大的经济效益.     

基于现场监测数据的岩质高边坡加固有限元分析——以贵州某岩质高边坡为例

本文以贵州省某岩质高边坡为例,首先分析了边坡三级平台排桩加固前后八个月的深孔监测数据,得到加固后深部监测孔位移仍在增加,边坡仍然处于不稳定状态。其次,利用FLAC3D有限元差分软件反演分析三级平台加固后坡体状况,并建立变换抗滑桩位置的加固模型,分析滑坡体的位移、剪应变增量和滑带位置的变化和分布情况,获得相应的边坡稳定系数,提出最优加固方案。第三,通过对该最优加固方案模拟计算,结果表明：二级平台处加桩坡体达到的稳定系数值最高,为1.25,加固后最大位移减小了22.5%,桩后滑带剪应变增量减小了20.69%,为指导该滑坡的后续加固治理工程提供了理论分析与基础。     

Miniaturized volume holographic optical data storage and correlation system with a storage density of 10 Gb／cm^3

The general idea of holographic optical data storage (HODS) is briefly introduced. Based on the recent advances of HODS, the key techniques and the challenges of HODS are discussed. Some new techniques are proposed to improve the system. A miniaturized volume holographic data storage and correlation system is presented. It can achieve a density of 10 Gb/cm^3 and a fast correlation recognition rate of more than 2000 images per second. It shows the attracting potential advantages over other conventional storage methods in the information storage as well as information processing.     

织纳地区龙潭组煤系页岩气储层特征与勘探潜力评价

为查明织纳地区龙潭组页岩气勘探前景,通过分析Z2井龙潭组泥页岩样品的矿物组成、有机地化特征、微观孔隙特征、钻孔泥页岩厚度、分布情况及其含气性特征,研究了龙潭组页岩气储层特征并对页岩气勘探潜力进行评价。结果表明：泥页岩有机质类型为Ⅱ₂-Ⅲ型,且以Ⅱ₂为主,总有机碳含量为1.34%~8.25%,平均值为3.68%,有机质成熟度为0.92%~3.24%,平均值为2.45%,属于高-过高成熟演化阶段,具有较好的生气潜力。扫描电镜结果显示泥页岩样品主要发育四类微观孔隙,包括粒内孔、粒间孔、有机质孔和微裂隙,内部孔隙发育,为页岩气提供良好的储集空间。Z2井泥页岩脆性矿物含量为24.40%~63.08%,平均值为41.22%,泥页岩总厚度为170.74m,占比42%,发育5个有效连续厚度大于15m的泥页岩层,与邻井可形成2个泥页岩层段,适宜进行压裂改造。织纳地区龙潭组泥页岩具备良好的生气条件、储集条件和可压裂性,具有较大勘探潜力。     

不同屋面雨水径流中PAHs污染特性对比分析

对南京市典型沥青屋面、瓦屋面径流中PAHs含量进行了9场降雨事件的现场取样监测,对比分析了2种不同屋面径流中PAHs的EMC值及其各组分的浓度,并对其初期效应及影响因素进行了分析和探讨.结果表明,沥青屋面径流PAHs污染较严重,其平均浓度为4 261.7 ng/L,而瓦屋面径流PAHs平均浓度仅为351.2 ng/L.沥青屋面、瓦屋面径流中PAHs均以4环组分为主,沥青屋面径流中3环组分占较大含量,而瓦屋面径流中5环和6环PAHs浓度仅次于4环PAHs.大多数降雨事件中总PAHs及各组分均存在较显著的初期效应;前期晴天数对PAHs在屋面的累积影响最大,瓦屋面径流PAHs含量受降雨强度影响较大,而沥青屋面径流PAHs含量受降雨量影响较大.     

基于密度可达的聚类隐私保护模型

针对面向聚类的数据隐私发布问题,基于密度可达邻域的概念,提出一种面向聚类的隐私保护模型PPC(r,ε,h).该模型通过要求隐藏后所有数据记录在ε内密度可达(r相关)的近邻数不小于h,以避免可能出现的近邻攻击.进一步提出密度可达安全邻域概念,对不满足模型要求的邻域,采用平移近邻的数据隐藏方法进行处理,保证发布后数据集满足模型约束.并利用邻域价值和邻域相似性的概念,对平移过程进行优化.理论分析和实验结果表明,基于PPC(r,ε,h)隐私模型设计的数据隐藏方法,能有效维持原数据集中数据点在各聚簇中的分布,且兼顾了发布后数据的聚类可用性和数据安全性.